Image Acquisition Control
Basler pilot 95
Determining whether your camera is operating with overlapped or non-overlapped exposures is not
a matter of issuing a command or switching a setting on or off. Rather the way that you operate the
camera will determine whether the exposures are overlapped or not overlapped. If we define the
“frame period” as the time from the start of exposure for one image acquisition to the start of
exposure for the next image acquisition, then:
Exposure will overlap when: Frame Period ≤ Exposure Time + Readout Time
Exposure will not overlap when: Frame Period > Exposure Time + Readout Time
You can calculate the readout time for a captured image by using the formula on page 99.
8.5.1 Guidelines for Overlapped Operation
If you will be operating the camera with overlapped exposure, there are two important guidelines to
keep in mind:
You must not begin the exposure time for a new image acquisition while the exposure time of
the previous acquisition is in progress.
You must not end the exposure time of the current image acquisition until readout of the
previously acquired image is complete.
The camera will ignore any trigger signals that violate these guidelines.
When you are operating a camera with overlapped exposure and using a hardware trigger signal
to trigger image acquisition, you could use the camera’s exposure time parameter settings and
timing formulas to calculate when it is safe to begin each new acquisition. However, there is a much
more convenient way to know when it safe to begin each acquisition. The camera supplies a “trigger
ready” signal that is specifically designed to let you trigger overlapped exposure safely and
efficiently.
For more information about using the Trigger Ready signal, see Section 8.6 on page 96.
For more detailed guidelines about using an external trigger signal with the trigger width exposure
mode and overlapped exposure, refer to the application notes called "Using a Specific External
Trigger Signal with Overlapped Exposure" (AW000565xx000). The application notes are available
in the downloads section of the Basler website: www.baslerweb.com.
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